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  1.  
  2. 		import java.io.*;
  3. import java.util.*;
  4.  
  5. class Test{
  6.     public static void main(String args[]){
  7.         // 標準のコンストラクタでは、現在の日時が設定される。
  8.         Calendar    cal = new GregorianCalendar();
  9.         printCalendar(cal);
  10.  
  11.         // 今から30日前
  12.         cal.add(Calendar.DATE, -30);
  13.         printCalendar(cal);
  14.  
  15.         // ありえない日付を設定するとこうなる。
  16.         cal.set(2004,cal.add(Calendar.FEBRUARY, 31);
  17.       //cal.set(2004,cal.add(cal.FEBRUARY, 31); としても同じ
  18.         printCalendar(cal);
  19.     }
  20.  
  21.     public static void printCalendar(Calendar cal){
  22.         char youbi[] = {' ','日','月','火','水','木','金','土'};
  23.         String    str = "";
  24.  
  25.         str +=  cal.get(Calendar.YEAR)     + "年";
  26.         str += (cal.get(Calendar.MONTH)+1) + "月";
  27.         str +=  cal.get(Calendar.DATE)     + "日(";
  28.  
  29.         str +=  youbi[cal.get(Calendar.DAY_OF_WEEK)];
  30.         str += ") ";
  31.         str +=  cal.get(Calendar.HOUR)     + ":";
  32.         str +=  cal.get(Calendar.MINUTE)   + ":";
  33.         str +=  cal.get(Calendar.SECOND)   + "(";
  34.         str +=  cal.get(Calendar.AM_PM) == Calendar.AM ? "AM" : "PM" ;
  35.         str += ") です。";
  36.         System.out.println(str);
  37.     }
  38. }
  39.  
  40.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
Main.java:16: error: ')' expected
        cal.set(2004,cal.add(Calendar.FEBRUARY, 31);
                                                   ^
1 error
stdout
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Standard output is empty
https://ideone.com/lraudy
language:
Java (12.0.1)
created:
10 years ago
visibility:
public

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